An idle rotation speed Nidl of an engine is set to increase with an increase in actual vehicle speed V and with an increase in measured temperature Tb of a battery (step S160). The drive control of the invention controls the engine and two motors to idle the engine at the preset idle rotation speed
An idle rotation speed Nidl of an engine is set to increase with an increase in actual vehicle speed V and with an increase in measured temperature Tb of a battery (step S160). The drive control of the invention controls the engine and two motors to idle the engine at the preset idle rotation speed Nidl and to ensure output of a required power corresponding to a torque demand Tr* to a drive shaft within a range between an input limit Win and an output limit Wout of the battery (steps S190 to S230). Such control enables the engine to have a high following capability and promptly change its output power level in response to a change in power demand P*, which is accompanied by an abrupt variation in torque demand Tr*. The technique of the invention thus desirably reduces the required level of charging or discharging of the battery, which is triggered by a response delay of the engine.
대표청구항▼
What is claimed is: 1. A power output apparatus that outputs power to a drive shaft, said power output apparatus comprising: an internal combustion engine; a power conversion mechanism that converts at least part of output power of the internal combustion engine into electric power; a motor that co
What is claimed is: 1. A power output apparatus that outputs power to a drive shaft, said power output apparatus comprising: an internal combustion engine; a power conversion mechanism that converts at least part of output power of the internal combustion engine into electric power; a motor that consumes the electric power converted by the power conversion mechanism to output power to the drive shaft; an accumulator unit that transmits electric power to and from the power conversion mechanism and the motor; a rotation speed measurement unit that measures a rotation speed of the drive shaft; and a control unit including :a target idle rotation speed setting module that sets a target idle rotation speed of the internal combustion engine corresponding to the measured rotation speed of the drive shaft; a power demand specification module that specifies a power demand required for the drive shaft; a target power setting module that sets a target power to be output from the internal combustion engine corresponding to the specified power demand; and a control module that, when the target power requires idling of the internal combustion engine, controls the internal combustion engine, the power conversion mechanism, and the motor to idle the internal combustion engine at the target idle rotation speed and to ensure output of a required power corresponding to the specified power demand to the drive shaft, when the target power does not require idling of the internal combustion engine, said control module controlling the internal combustion engine, the power conversion mechanism, and the motor to ensure output of the target power from the internal combustion engine and to ensure output of a required power corresponding to the specified power demand to the drive shaft. 2. A power output apparatus in accordance with claim 1, wherein said target idle rotation speed setting module sets the target idle rotation speed to increase with an increase in measured rotation speed of the drive shaft. 3. A power output apparatus in accordance with claim 1, said power output apparatus further comprising: a temperature measurement unit that measures temperature of the accumulator unit, wherein said target idle rotation speed setting module sets the target idle rotation speed according to the measured temperature of the accumulator unit. 4. A power output apparatus in accordance with claim 3, wherein said target idle rotation speed setting module sets the target idle rotation speed to increase with an increase in measured temperature of the accumulator unit. 5. A power output apparatus in accordance with claim 1, wherein the power conversion mechanism is connected to an output shaft of the internal combustion engine and to the drive shaft and outputs at least part of the output power of the internal combustion engine to the drive shaft through input and output of electric power and mechanical power. 6. A power output apparatus in accordance with claim 5, wherein the power conversion mechanism comprises: a three shaft-type power input output module that is linked to three shafts, that is, the output shaft of the internal combustion engine, the drive shaft, and a rotating shaft, and automatically determines power input from and output to a residual one shaft based on powers input from and output to any two shafts among the three shafts; and a generator that inputs and outputs power from and to the rotating shaft. 7. A power output apparatus in accordance with claim 5, wherein the power conversion mechanism comprises a pair-rotor motor that has a first rotor linked to the output shaft of the internal combustion engine and a second rotor linked to the drive shaft and is driven by relative rotation of the first rotor to the second rotor. 8. A hybrid vehicle comprising: an internal combustion engine; a power conversion mechanism that converts at least part of output power of the internal combustion engine into electric power; a motor that consumes the electric power converted by the power conversion mechanism to output power to a drive shaft linked to an axle; an accumulator unit that transmits electric power to and from the power conversion mechanism and the motor; a vehicle speed measurement unit that measures a vehicle speed; and a control unit including :a target idle rotation speed setting module that sets a target idle rotation speed of the internal combustion engine corresponding to the measured vehicle speed; a power demand specification module that specifies a power demand required for the drive shaft; a target power setting module that sets a target power to be output from the internal combustion engine corresponding to the specified power demand; and a control module that, when the target power requires idling of the internal combustion engine, controls the internal combustion engine, the power conversion mechanism, and the motor to idle the internal combustion engine at the target idle rotation speed and to ensure output of a required power corresponding to the specified power demand to the drive shaft, when the target power does not require idling of the internal combustion engine, said control module controlling the internal combustion engine, the power conversion mechanism, and the motor to ensure output of the target power from the internal combustion engine and to ensure output of a required power corresponding to the specified power demand to the drive shaft. 9. A hybrid vehicle in accordance with claim 8, wherein said target idle rotation speed setting module sets the target idle rotation speed to increase with an increase in measured vehicle speed. 10. A hybrid vehicle in accordance with claim 8, said hybrid vehicle further comprising: a temperature measurement unit that measures temperature of the accumulator unit, wherein said target idle rotation speed setting module sets the target idle rotation speed according to the measured temperature of the accumulator unit. 11. A hybrid vehicle in accordance with claim 10, wherein said target idle rotation speed setting module sets the target idle rotation speed to increase with an increase in measured temperature of the accumulator unit. 12. A hybrid vehicle in accordance with claim 8, wherein the power conversion mechanism is connected to an output shaft of the internal combustion engine and to the drive shaft and outputs at least part of the output power of the internal combustion engine to the drive shaft through input and output of electric power and mechanical power. 13. A hybrid vehicle in accordance with claim 12, wherein the power conversion mechanism comprises: a three shaft-type power input output module that is linked to three shafts, that is, the output shaft of the internal combustion engine, the drive shaft, and a rotating shaft, and automatically determines power input from and output to a residual one shaft based on powers input from and output to any two shafts among the three shafts; and a generator that inputs and outputs power from and to the rotating shaft. 14. A hybrid vehicle in accordance with claim 12, wherein the power conversion mechanism comprises a pair-rotor motor that has a first rotor linked to the output shaft of the internal combustion engine and a second rotor linked to the drive shaft and is driven by relative rotation of the first rotor to the second rotor. 15. A control method of a power output apparatus, which includes an internal combustion engine, a power conversion mechanism that converts at least part of output power of the internal combustion engine into electric power, a motor that consumes the electric power converted by the power conversion mechanism to output power to a drive shaft, and an accumulator unit that transmits electric power to and from the power conversion mechanism and the motor, said control method comprising the steps of: setting a target power to be output from the internal combustion engine corresponding to a specified power demand required for the drive shaft; and when the target power requires idling of the internal combustion engine, setting a target idle rotation speed of the internal combustion engine corresponding to a measured rotation speed of the drive shaft and controlling the internal combustion engine, the power conversion mechanism, and the motor to idle the internal combustion engine at the target idle rotation speed and to ensure output of a required power corresponding to the specified power demand to the drive shaft, when the target power does not require idling of the internal combustion engine, controlling the internal combustion engine, the power conversion mechanism, and the motor to ensure output of the target power from the internal combustion engine and to ensure output of a required power corresponding to the specified power demand to the drive shaft. 16. A control method of a hybrid vehicle, which includes an internal combustion engine, a power conversion mechanism that converts at least part of output power of the internal combustion engine into electric power, a motor that consumes the electric power converted by the power conversion mechanism to output power to a drive shaft, and an accumulator unit that transmits electric power to and from the power conversion mechanism and the motor, said control method comprising the steps of: setting a target power to be output from the internal combustion engine corresponding to a specified power demand required for an axle; and when the target power requires idling of the internal combustion engine, setting a target idle rotation speed of the internal combustion engine corresponding to a measured vehicle speed and controlling the internal combustion engine, the power conversion mechanism, and the motor to idle the internal combustion engine at the target idle rotation speed and to ensure output of a required power corresponding to the specified power demand to the axle, when the target power does not require idling of the internal combustion engine, controlling the internal combustion engine, the power conversion mechanism, and the motor to ensure output of the target power from the internal combustion engine and to ensure output of a required power corresponding to the specified power demand to the axle.
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이 특허에 인용된 특허 (7)
Pels Thomas,DEX ; Revermann Klaus,DEX ; Zeyen Klaus-Peter,DEX, Apparatus for controlling the idling speed of an internal combustion engine.
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